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Document and Entity Information
Jan. 13, 2021
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001326110
Document Type 8-K
Document Period End Date Jan. 13, 2021
Entity Registrant Name NantKwest, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-37507
Entity Tax Identification Number 43-1979754
Entity Address, Address Line One 3530 John Hopkins Court
Entity Address, City or Town San Diego
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92121
City Area Code (858)
Local Phone Number 633-0300
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.0001 par value per share
Trading Symbol NK
Security Exchange Name NASDAQ
Entity Emerging Growth Company false